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The geometries made by the 3D printing of the AAD-CS-Fe DN hydrogel containing 8 mg·mL−1 nano-Fe3O4. (a) A 3D model of the DN hydrogel in the pre-solution just after printing. (b) The 3D geometries made by the 3D printing. From left to right: Quadrangular pyramid, left ear, hexagonal prism, cuboid, nose, letters. The height of the corresponding models is shown in the red box. Adapted with permission from [30]. Copyright 2021, Wiley-VCH.
